There have been a few radically different versions of your dad's favorite band, Genesis. In their early days, they were a progressive rock group fronted by Peter Gabriel. If you're curious, "progressive rock" is just a short way of saying "ridiculously long songs played in wacky time signatures and also some jazz stuff." To keep pace with the outlandishness of the band's music at the time, Peter Gabriel regularly took the stage draped in crazy costumes like the sunflower monster pictured above (on the left) and this terrifying getup:
What Clive Barker movie is this from again?
Like most others of the crazy variety, this was a train that couldn't run forever. Eventually, Gabriel grew disenchanted with the confines of working within a band, while the band got tired of competing for attention with a dude dressed like a flower, and it was amicably agreed that Gabriel would leave. Phil Collins, who was the drummer at the time, famously assumed the role of lead singer after an exhaustive search of more than 400 vocalists failed to turn up a suitable replacement for Gabriel.
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Can you guess who "coached" the potential singers during the auditions?
The prevailing historical opinion is that, after taking over frontman duties, Collins proceeded to completely ruin the Genesis legacy, turning the band into wussy music for boring adults, but it's not like Gabriel left and the band released "Invisible Touch" the next day or anything. In fact, the first Genesis album featuring Collins on lead vocals (A Trick of the Tail) is still pretty fucking strange and "progressive" compared to their more well-known work. Have a listen to "Dance on a Volcano," the first song on the album: